the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Deriving Photosynthetically Active Radiation at ground level in cloud-free conditions from Copernicus Atmospheric Monitoring Service (CAMS) products
Abstract. A method is described that estimates the photosynthetically active radiation (PAR) at ground level in cloud-free conditions. It uses a fast approximation of the libRadtran radiative transfer numerical model, known as the k-distribution method and the correlated-k approximation of Kato et al. (1999). LibRadtran provides irradiances aggregated over several fixed spectral bands and a spectral resampling is proposed followed by an aggregation in the range [400, 700] nm. The Copernicus Atmosphere Monitoring Service (CAMS) produces daily estimates of the aerosol properties, and total column contents in water vapor and ozone that are input to the method. A comparison of the results is performed against instantaneous measurements of global Photosynthetic Photon Flux Density (PPFD) on a horizontal plane made in cloud-free conditions at seven sites of the Surface Radiation network (SURFRAD) in the USA in various climates. The bias ranges between −12 µmol m−2 s−1 (−1 % of the mean value at Desert Rock) and +61 µmol m−2 s−1 (+5 % at Penn. State Univ). The root mean square error ranges from 37 µmol m−2 s−1 (3 %) to 82 µmol m−2 s−1 (6 %). The coefficient of determination R2 ranges between 0.97 and 0.99. This work demonstrates the quality of the proposed method combined with the CAMS products.
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RC1: 'Review', Anonymous Referee #1, 05 Feb 2018
- AC1: 'ANSWERS TO REFEREE #1', William Wandji, 20 Apr 2018
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RC2: 'Deriving Photosynthetically Active Radiation at ground level in cloud-free conditions from Copernicus Atmospheric Monitoring Service (CAMS) products', Anonymous Referee #2, 09 Feb 2018
- AC2: 'ANSWERS TO REFEREE #2', William Wandji, 20 Apr 2018
-
RC3: 'Review of Wandji Nyamsi et al Biogeosciences', Anonymous Referee #3, 17 Feb 2018
- AC3: 'ANSWERS TO REFEREE #3', William Wandji, 20 Apr 2018
-
RC1: 'Review', Anonymous Referee #1, 05 Feb 2018
- AC1: 'ANSWERS TO REFEREE #1', William Wandji, 20 Apr 2018
-
RC2: 'Deriving Photosynthetically Active Radiation at ground level in cloud-free conditions from Copernicus Atmospheric Monitoring Service (CAMS) products', Anonymous Referee #2, 09 Feb 2018
- AC2: 'ANSWERS TO REFEREE #2', William Wandji, 20 Apr 2018
-
RC3: 'Review of Wandji Nyamsi et al Biogeosciences', Anonymous Referee #3, 17 Feb 2018
- AC3: 'ANSWERS TO REFEREE #3', William Wandji, 20 Apr 2018
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